David Cameron say the UK will be made safer by launching air strikes on Islamic State targets within Syria alongside the US-led coalition.
Medecins Sans Frontieres (MSF) has said it is “disgusted” by Afghan government justifications for the air strikes on a hospital in the city of Kunduz, which left 22 people dead, calling it a “war crime”.
Russian air strikes have targeted rebel-held areas in northwest Syria for a second day.
The US and Russian military will begin discussions “as soon as possible” to avoid direct clashes in the air above Syria, top diplomats have said.
Russia has begun air strikes against rebel positions within Syria, with the first target near the western city of Homs, US defence officials say.